In thart case, youre getting it right.
Tge najor disadvantage in modern times is ethics. Should we be allowed to stop a baby by abortion just because its haemophiliac? What gives us the right to take away an other persons life. Should we go for germline gene therapy, and so create mutants?
These are questions that relate to societal standpoint. Bioligically, it can be argued that we re moving towards a genetically altered population. We are artificially enacting the survival of the fittest theme. This is eugenics, and in nature it results in gradual evolution of better adaptations. However, can be predictwhat is helpful today will remain so with changing env cobditions?